When saving a LibreOffice Impress presentation as Microsoft Powerpoint, some slides do not show content in the saved Powerpoint file, even though they had text and graphics in them.
After playing around, found that the slides that did not convert were the ones where no Title text was entered above the bulleted text. This means that to successfully convert all LibreOffice Impress slides to Microsoft Powerpoint, each LibreOffice Impress slide must have a Title.
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